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Its Double XP weekend in Call of Duty World at War

Well the title says it all. Jump onto CODWW multiplayer and get double XP, a good time to get prestige if you haven't already.
It starts on Friday 10.00am PDT and ends on Monday 10.00pm PDT
Source

Also if you havent already, pick up Map Pack 1, which comes with 3 maps and a zombie map.